Joe - those are great signed T206 cards. All but the Marquard is from the 2007 Pittsburgh Find, and I remain confident are authentic.
The Marquard is actually from an eBay auction of four signed Marquards in 2004. I was the one that had the card authenticated by JSA/SGC, and I still have two others from that lot of four. They were my first four signed T206 cards ever to grace my collection. I can't see the serial numbers on yours clearly, but based on mine I'd guess 9005220-001 or 003.
Here are mine -- you won't find them on Worthpoint or Cardtarget, unless they go back to 2004, and in such instance you'll find only the signed versions!
